Intellect Devourer
Most theft effects grab a single target and stash it: a spell off the top, a creature to control, a graveyard to mine. This Horror widens the heist to the whole table at once, taking exactly one card from each opponent's hand when it lands and holding those cards in exile while it survives. Those cards are yours to play, castable with mana of any color so a stolen dual-colored bomb is never stranded for want of the right source. The two abilities lean on each other by design: one does the taking, the other the spending, and the color-fixing rider means nothing swallowed goes to waste. The leash is what balances it. Anything still exiled returns the instant the creature leaves, so the whole engine hangs on a 2/4 body that every opponent has reason to kill. That turns each removal spell into a rescue mission for whatever got exiled, and forces a small game of chicken: spend the answer now and hand the cards straight back, or let a single fragile creature keep sitting on a pile of borrowed options. It is genuinely multiplayer-native design, where the number of opponents scales the payoff directly and the check on that payoff is not a counter or a tap ability but the plain vulnerability of the thing doing the stealing.
